Radeon HD 3650 vs Radeon HD 4650 1GB

Intro

Compare those specifications to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 RAM works at a frequency of 700 MHz on this particular card. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon HD 3650		78 Watts
	Difference: 23 Watts (42%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3650 should in theory be a bit better than the Radeon HD 4650 1GB in general. (explain)

Radeon HD 3650		25600 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 3200 (14%)

Texel Rate

The Radeon HD 4650 1GB is quite a bit (approximately 231%) more effective at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 13400 (231%)

Pixel Rate

The Radeon HD 4650 1GB should be quite a bit (approximately 66%) better at anti-aliasing than the Radeon HD 3650, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 1900 (66%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.